Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a4d1f12602d271a83933930e0c99bb606d0168a8bf232c314c26711bf75b310:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16